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PMT Focus : Assertion reason type questions

The following questions consists of two statements , Assertion and Reason. While answering these questions choose any of the following four responses
A. If both assertion and reason are true and the reason is correct explanation of assertion.
B. If both assertion and reason are true but reason is not a correct explanation of assertion.
C. If assertion is true and reason is false.
D. If both assertion and reason are false.

1. Assertion : In series LCR circuit , resonance occurs only at one frequency.
    Reason :  At this frequency inductive reactance is equal to capacitive reactance.
(a) A
(b) B
(c) C
(d) D

2. Assertion: Insulators do not allow the flow of current through themselves.
    Reason: They have no free charge carriers.

(a) A
(b) B
(c) C
(d) D



3. Assertion : When temperature of cold junction of a thermocouple is lowered , the value of neutral temperature of this thermocouple is raised
 Reason : When the difference of temperature of two junction is raised , more thermo e.m.f. is produced.

(a) A
(b) B
(c) C
(d) D



4. Assertion : If two parallel wires , hanging freely are connected to a battery in series , they come closer to each other.
Reason : Force of attraction acts between two wires crying charge 

(a) A
(b) B
(c) C
(d) D



5. Assertion : If an electron and proton enter an electric field with equal energy , then path of electron is more curved then that of electron.
 Reason : electrons has a tendency to form curve.

(a) A
(b) B
(c) C
(d) D






Answer:
1. a
2. a
3. d  here both assertion and reason are not true
4. d when two long parallel wires are connected to battery in series they carry current in opposite direction and hence repel each other.
5. d

Surface tension fact file

  1. Those factors which increases cohessive forces between liquid molecules increases surface tension and those decreases cohesive forces decreases surface tension.
  2. If impurity is completely soluble , then on mixing it in the liquid , its surface tension increases.
  3. With the increase in temperature surface tension decreases.
  4. Surface tension depands on the medium present on other side of the liquid surface.
  5. The surface tension decreases due to electrification.
  6. On mixing partial soluble impurities in a liquid , its surface tension decreases like mixing of detergent in water decreases surface tension of water.

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